1991 Johnson/Evinrude EI 60 thru 70 outboards Service Manual, Page 78Get this manual
"Install gearcase pressure tester toI
pulse hose fittingPump to 15 PSIPump holds pressure?
Slowly pump gearcase testerInspect for escaping air Does pump click several times with each stroke of tester?
Hold pump in normal running position Cover fuel outlet, remove pressure hose from pulse fittingPump should not clickDid pump click?
PUMP Wait secondsUncover fuel outletPump should clickDid pump click?
STOP HEREAir motor housing is cracked or leakingRepair leak or INSTALL MOTOR HOUSING KIT